<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>菜鸟教程(runoob.com)</title>
<script src="http://static.runoob.com/assets/jquery-validation-1.14.0/lib/jquery.js"></script>
<script src="http://static.runoob.com/assets/jquery-validation-1.14.0/dist/jquery.validate.min.js"></script>
<script src="http://static.runoob.com/assets/jquery-validation-1.14.0/dist/localization/messages_zh.js"></script>
<script>
$.validator.setDefaults({
    submitHandler: function() {
      alert("提交事件!");
    }
});

$().ready(function() {
  // 提交时验证表单
  var validator = $("#form1").validate({
    errorPlacement: function(error, element) {
      // Append error within linked label
      $( element )
        .closest( "form" )
          .find( "label[for='" + element.attr( "id" ) + "']" )
            .append( error );
    },
    errorElement: "span",
    messages: {
      user: {
        required: " (必需字段)",
        minlength: " (不能少于 3 个字母)"
      },
      password: {
        required: " (必需字段)",
        minlength: " (字母不能少于 5 个且不能大于 12 个)",
        maxlength: " (字母不能少于 5 个且不能大于 12 个)"
      }
    }
  });

  $(".cancel").click(function() {
    validator.resetForm();
  });
});
</script>
<style>
.error{
  color:red;
}
</style>
</head>
<body>
<form method="get" class="cmxform" id="form1" action="">
  <fieldset>
    <legend>登录框</legend>
    <p>
      <label for="user">用户名</label>
      <input id="user" name="user" required minlength="3">
    </p>
    <p>
      <label for="password">密码</label>
      <input id="password" type="password" maxlength="12" name="password" required minlength="5">
    </p>
    <p>
      <input class="submit" type="submit" value="Login">
    </p>
  </fieldset>
</form>
</body>
</html>